Remove UI Control edit box referenced with handles

Question

Karthik KJ 2012-6-27

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/42200-remove-ui-control-edit-box-referenced-with-handles

Hi,

I have created an UI control edit boxes and are created and stored in handles for eg

for i=1:20
handles.sensname(i) = uicontrol('style', 'edit','Position',  [95, b-(i-1)*20, 180, 17],'BackgroundColor',[1 1 1]);
end

Now after creating this, i want to delete the ui control editboxes. What i tried is

        for i=1:20
            delete(handles.sensname(i));
        end

But I am getting the error 'Root object may not be deleted'. i know it may be that handle values cannot be deleted, then how to solve my problem?

Appreciate any idea to solve this

Karthik

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Answer 1

Walter Roberson 2012-6-27

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Is it possible that your code is not quite as shown, and that you initialize handles.sensname as an array with more elements than you store handles for? If so then the extra entries would be 0 and you would get the error you get.

Suggested replacement code (no loop needed)

delete( handles.sensname(handles.sensname > 0) );

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Karthik KJ 2012-6-27

no that also not woking.

I have added the code below, which comes under a pushbutton,

if str2num(get(handles.nosensorentry_tag,'string'))<26

for i=1:str2num(get(handles.nosensorentry_tag,'string'))

handles.sensname(i) = uicontrol('style', 'edit','Position', [95, b-(i-1)*20, 180, 17],'BackgroundColor',[1 1 1]);

handles.sensnot(i) = uicontrol('style', 'edit','Position', [410, b-(i-1)*20, 45, 17],'BackgroundColor',[1 1 1]);

handles.sensvtsno(i) = uicontrol('style', 'edit','Position', [535, b-(i-1)*20, 40, 17],'BackgroundColor',[1 1 1],'string',i);

handles.sensmeasno(i) = uicontrol('style', 'edit','Position', [650, b-(i-1)*20, 40, 17],'BackgroundColor',[1 1 1]);

end

handles.count=str2num(get(handles.nosensorentry_tag,'string'));

guidata(hObject, handles);

else

for i=1:handles.count

delete(handles.sensname(handles.sensname > 0) );

end

for i=1:str2num(get(handles.nosensorentry_tag,'string'))

if i<26

handles.sensname(i) = uicontrol('style', 'edit','Position', [5, b-(i-1)*20, 180, 17],'BackgroundColor',[0.941 0.922 0.557]);

handles.sensnot(i) = uicontrol('style', 'edit','Position', [385, b-(i-1)*20, 45, 17],'BackgroundColor',[0.941 0.922 0.557]);

handles.sensvtsno(i) = uicontrol('style', 'edit','Position', [510, b-(i-1)*20, 40, 17],'BackgroundColor',[0.941 0.922 0.557],'string',i);

handles.sensmeasno(i) = uicontrol('style', 'edit','Position', [625, b-(i-1)*20, 40, 17],'BackgroundColor',[0.941 0.922 0.557]);

guidata(hObject, handles)

else

handles.sensname(i) = uicontrol('style', 'edit','Position', [188, b-(i-26)*20, 180, 17],'BackgroundColor',[0.886 0.855 0.612]);

handles.sensnot(i) = uicontrol('style', 'edit','Position', [435, b-(i-26)*20, 45, 17],'BackgroundColor',[0.886 0.855 0.612]);

handles.sensvtsno(i) = uicontrol('style', 'edit','Position', [555, b-(i-26)*20, 40, 17],'BackgroundColor',[0.886 0.855 0.612],'string',i);

handles.sensmeasno(i) = uicontrol('style', 'edit','Position', [675, b-(i-26)*20, 40, 17],'BackgroundColor',[0.886 0.855 0.612]);

guidata(hObject, handles)

end

Karthik KJ 2012-6-27

Hi Walter,

You are correct, i was initialising with higher number of entries , now i corrected it . Now this code is working. Thanks alot Walter,Sean,Jan

for i=1:20

delete(handles.sensname(i));

end

Walter Roberson 2012-6-27

More efficient would be

delete(handles.sensname(1:20));

with no loop (just the one line.)

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Answer 2

Sean de Wolski 2012-6-27

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That means that handles.sensname(i) is returning a 0, the handle to the root object.

It it kind of hard to tell you what is broken with it, but perhaps you could just check for zeros first.

for ii = 1:10;
 if logical(handles.sensname(ii))
   delete(handles.sensname(ii));
 end
end

More Note also that if I run those two lines of code back2back I don't get the error:

figure;
for i=1:20
  handles.sensname(i) = uicontrol('style', 'edit','Position',  [95, pi-(i-1)*20, 180, 17],'BackgroundColor',[1 1 1]);
end
for i=1:20
  delete(handles.sensname(i));
end

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Karthik KJ 2012-6-27

I am not quite sure about my understanding towards handles, as i shown the example delete(u) will delete the edit box got created. But if I am deleting the edit boxes created using the gui handles, i could not able to delete the created edit boxes.

Referencing in handles, i thought handle of the uicontrol cant be deleted.